Interlock System; Typical Layout For Vacuum Circuit Breaker - GE SecoVac Series Manual

Interlock system

For personnel safety, SecoVac 3.3kV-27kV
is designed with a number of mechanical
and electrical interlocks. For example,
breaker contacts must be open before
the breaker can be moved from test to
service position. A positive mechanical
stop is provided when the breaker
reaches the service or test/disconnect
positions. Mechanical rejection interlocks
are provided to permit only the insertion
RI SURSHUO\ UDWHG EUHDNHUV LQWR VSHFL¿F
compartments.
These and other necessary interlocks
provide a comprehensive safety system.
Furthermore, springs automatically
discharge when the breaker is withdrawn
from the service position and breakers
cannot be inserted in the closed position.
Undercart
6HFR*HDU R HUV PDQXDO RSHUDWLRQ
undercart system which can be operated
for racking in and out. The undercart has
an interlock with earthing switch, which
prevents misoperation. And it also allows
earthing function of circuit breaker by
means of metallic structure.

Typical layout for vacuum circuit breaker

Tripping button
1
2 Status indicator for charging
Closing button
3
Counter
4
Indicator for open or close

6 Charging handle
Upper contact arm
1
2 Embedded poles
Lower contact arm
3
Tulip cluster
4
SecoVac 3.3kV-27kV Embedded Pole Vacuum Circuit Breaker
1
2
Figure 1. Front facial of the circuit breaker
Figure 2. Primary circuit
3
4

6
1
2
3
4
13